Add missing @since 4.9 for new API PackParser.setExpectedObjectCount()

Change-Id: I58fa956aea37c696dbc35ecd229d8971d532923f
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit/src/org/eclipse/jgit/transport/PackParser.java

@@ -1271,6 +1271,7 @@ public abstract class PackParser {
 	 * they should call this method during {@link #onPackHeader(long)}.
 	 *
 	 * @param expectedObjectCount
+	 * @since 4.9
 	 */
 	protected void setExpectedObjectCount(long expectedObjectCount) {
 		this.expectedObjectCount = expectedObjectCount;